Abstract

Exploration of cost-effective high-performance non-noble-metal-based electrocatalysts for the hydrogen evolution reaction (HER) has attracted huge attention. In this work, a nitrogen doping method is adopted to construct self-supported, N-doped NiO nanosheet arrays (N-NiO) as an effective HER electrocatalyst. The N-NiO nanosheet arrays are firmly anchored on a nickel foam substrate, forming a free-standing integrated electrode with an open nanostructure. By virtue of its larger electrochemical active surface areas and better electron conductivity, the N-NiO electrode has admirable electrocatalytic HER performance with a low overpotential (154 mV at a current density of 10 mA cm⁻²) and a low Tafel slope of 90 mV dec⁻¹. In addition, the N-NiO nanosheet arrays exhibit relatively stable electrocatalytic activity after a 10 h continuous test in an alkaline solution. Our reported rational design principle and optimization strategy provide a powerful way to construct advanced transition-metal-based electrocatalysts for the HER.

Graphic Abstract

中文翻译：

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N 掺杂 NiO 纳米片阵列作为产氢反应的高效电催化剂

摘要

用于析氢反应（HER）的低成本高性能非贵金属基电催化剂的探索引起了极大的关注。在这项工作中，采用氮掺杂方法构建自支撑、N 掺杂的 NiO 纳米片阵列（N-NiO）作为有效的 HER 电催化剂。N-NiO 纳米片阵列牢固地固定在镍泡沫基材上，形成具有开放纳米结构的独立集成电极。由于其更大的电化学活性表面积和更好的电子导电性，N-NiO电极具有令人钦佩的电催化HER性能，具有低过电位（10 mA cm ^-2电流密度下为154 mV ）和90 mV的低Tafel斜率十二月^-1. 此外，在碱性溶液中连续测试 10 小时后，N-NiO 纳米片阵列表现出相对稳定的电催化活性。我们报告的合理设计原则和优化策略为构建先进的基于过渡金属的 HER 电催化剂提供了有力的方法。

图形摘要